Container base



FIG. 1 is a top perspective view showing my new design for a containerbase;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is bottom view thereof.

The ornamental design for a container base, as shown and described.